<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul
          class="cart-list"
          v-for="(cartInfo) in cartInfoList"
          :key="cartInfo.id"
        >
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="cartInfo.isChecked == 1"
              @click="updateChecked(cartInfo.skuId, $event.target.checked)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl" />
            <div class="item-msg">{{ cartInfo.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a @click="changeNum('sub', -1, cartInfo)" class="mins">-</a>
            <input
              autocomplete="off"
              type="text"
              :value="cartInfo.skuNum"
              minnum="1"
              class="itxt"
              @change="changeNum('value', $event.target.value, cartInfo)"
            />
            <a @click="changeNum('add', 1, cartInfo)" class="plus">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartInfo.skuNum * cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a
              href="#none"
              class="sindelet"
              @click="deleteCartById(cartInfo.skuId)"
              >删除</a
            >
            <br />
            <!-- <a href="#none">移到收藏</a> -->
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all" >
        <input
          class="chooseAll"
          type="checkbox"
          :checked="isChooseAll && cartInfoList.length > 0"
          id=""
          name=""
          @change="chooseAllorNot($event.target.checked)"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteChooseCart">删除选中的商品</a>
        <!-- <a @click="">移到我的关注</a>
        <a @click="">清除下柜商品</a> -->
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ chooseNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ choosePrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="goTrade">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from "vuex";
import throttle from "lodash/throttle";

export default {
  name: "ShopCart",
  data() {
    return {};
  },
  mounted() {
    //组件挂载完毕，向服务器请求数据
    this.getData();
  },
  methods: {
    //派发请求数据
    getData() {
      this.$store.dispatch("cartList");
    },
    //更改商品数量（节流）
    changeNum: throttle(async function (type, value, sku) {
      switch (type) {
        case "add":
          value = 1;
          break;
        case "sub":
          value = sku.skuNum > 1 ? -1 : 0;
          break;
        case "value":
          if (isNaN(value) || value < 1) value = 0;
          else value = parseInt(value) - sku.skuNum;
          break;
      }
      try {
        await this.$store.dispatch("addOrUpdateShopCar", {
          skuId: sku.skuId,
          skuNum: value,
        });
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    }, 500),

    //删除产品
    async deleteCartById(skuId) {
      try {
        await this.$store.dispatch("deleteCart", skuId);
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },
    //修改勾选状态
    async updateChecked(skuId, isChecked) {
      try {
        isChecked = isChecked == true ? 1 : 0;
        await this.$store.dispatch("changeChecked", { skuId, isChecked });
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },
    //删除选中的商品
    async deleteChooseCart(){
      try {
        await this.$store.dispatch('deleteAllCart');
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },
    //全选或全不选产品
    async chooseAllorNot(isChecked){
      try {
        isChecked = isChecked == true ? 1 : 0;
        await this.$store.dispatch('changeCheckedAllOrNot',isChecked);
        this.getData();
      } catch (error) {
        alert(error.message)
      }
    },
    goTrade(){
      this.$router.push('/trade')
    }
  },
  computed: {
    ...mapGetters(["cartList"]),
    cartInfoList(){
      return this.cartList.cartInfoList || []
    },
    //计算勾选项
    chooseNum() {
      let num = 0;
      for (let cart of this.cartInfoList) {
        num += cart.isChecked == 1 ? 1 : 0;
      }
      return num;
    },
    //计算勾选项总价
    choosePrice() {
      let price = 0;
      for (let cart of this.cartInfoList) {
        if (cart.isChecked == 1) {
          price += cart.skuPrice * cart.skuNum;
        }
      }
      return price;
    },
    //是否全选
    isChooseAll() {
      return this.cartInfoList.every((item)=>item.isChecked == 1)
    },
  },
}; 
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 15%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>